Improvement in centrifugal crushing-mills



.I Chelsea, in the county'of Suffolk and Stateof Y Massachusetts,

ings which spec'iiieatiom'isa description of my invention practice it.

i centrifugal crushing or improvement consistingin combining with.

' nearly radial directions from the hub d to the disk b and its arms c do not extend across the straight belt, u.-

UNITED ,STATES PArENT @BrienL C. H. GRIFFIN, 0F CHELSEA, MASSACHUSETTS.

Specification forming part of Letters Patent No. 45,2 13,

dated NovembsrQQ, 1864.

To @ZZ-whom tm/ay concer-n: l

-Bea known .that 1,' e. H. ammini, 0f

have invented new and useful Improvementsin Centrifugal Pulverizing- Machines; and I do hereby declare that the' `following, taken in connection with the drawaccompany and form part of this sufficient to enable those skilled in the art to rlhis invention relates to the construction of pulverizingumills, the

the rotary arms or projectors a serrated or toothed wheelrotating in the opposite direction tothe arms; also, in the employment in y connection Withthe pulverirfxedA material into a receiver of another pipe which conducts the l pipelleading from said receiver into the pul- Verizer.

Figurev 1 of the drawings represents a perspective view ot' a crushing' apparatus embodyin g my invention. Fig. 2 is a view ofthe pulverizer-case, one plate or side thereof being removed.

a denotes the pulverizer-case providedwith arotary disk, b, which carries the arms or projectors c, said arms (extending in radial or perimeter of the disk b, and receiving a rotary motion from the shaft e, which is supported in v bearings ff on'one side of the frame g and in the hub fh on the adjacent side of the case a. This case is stationary, and is supported and fastened in vertical position in the frame g, :its twoy halves being connected together and fastened by the flan ges z The lwhole inner diameter of the ease a, but only partially so, the concentric space beyond the arms being iilled or partially iilled by a rotary wheel, 70,011 a disk, l, mounted on a shaft, m, rotating in bearings n a on the opposite side of the frame g.

Motion is communicated to the shaft e by a crossbelt, o, running overa pulley,.p, on the shaft e, and a driving-pulley, (1 on the main shaft 1'. The opposite end oi' this shaft rearries a pulley, s, from which motion is eonimul nicated to a pulley, t, on the shaft m by al rlhus it will be seen that-,1'

the projectorarms c and the wheel l: beyond them are driven in opposite directions, which opposite rotation being e'ected as shown, or

in any other convenient manner.

The innerisurface of the wheel k is constructed with a series of serrations or teeth, one surface, c, of each oi which is made in or about in a radial direction from the center of lthe wheel, and such distance being left between the consecutive teeth that as the arms c, in their rotation, project the material to be crushed against the wheel k, such .material shall be thrown against these revolving surfaces, the force of the throw or projection of the material in one direction against the surl faces rotating in the opposite direction having ainuch more powerful eft'ect in breaking up and powdering the material by the percussion than if the arm c alone rotated and threw the material against the stationary surface ofthe case a.

The feedpipe by which the material to be operated upon is introduced into the case a, is seen at w, and the pipe by which the powdered or crushed material is conducted by the blast from the case a into the receiver m is seen at y. As the receiver h's to be closed to prevent escape of dust or tine material, the operation ofthe blast creates a pressurein the box or receiver a. To relieve this pressure and restore the equilibrium between the pressureiu the box x and the-ease a, I conduct a pipe, z, from the box a; into the feedpipe, said pipe leading from at ornear the top of the box Thus as there is a pressure of air` into the receiver from the case a and a consequent exhaust of air in the case a air is forced from the top of the receiver through the pipe e, such air increasing the draft to draw the material into the machine through the feed-pipe, and at the same time restoring thegpressure between the receiver and the case a. y

I sometimes employ a vertical Ventilatingpipe, j, issuing from the top of the box The pressure from the blast forces the air up through the pipe, and to prevent loss of any of the powdered material which may be cai'- ried into the pi pc bythe pressure of the blast, I conduct the pipe to such height that the gravity of the material shall overcome the pressure from the blast and canse the powder to drop again into the box.m rlhis pipeis intended 'principally i'or use when the pipe .c is

l. .Combining with the projeoinrsnr impe! ling arms of a centrifugal crushing or pulverizing machine series of rottin g teeth or percussion surfaces rotating in theoppos'itc dfirection,`substantially als set forth.

2. The employment of the pipe z in com- ..-v

bination with the receiver and pulverizer, substantially as described.

G. kH. GRIFFIN.

Witnesses z 1, Geneve CEAS. O. AYER.. 

